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ODE→a (2)

a (2)

Flag: gbEnglishOxford Dictionary of English
a2
▸ abbreviation
1 (in travel timetables) arrives:
Penzance a 0915.
2 [in combination] (in units of measurement) atto- (10−18).
3 British English (with reference to sporting fixtures) away:
March 15 Sheffield United (a).
4 (used before a date) before:
a1200.
[from Latin ante]
▸ (a) symbol Physics acceleration.